/*
 * Copyright (c) 2008-2010, Matthias Mann
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Matthias Mann nor the names of its contributors may
 *       be used to endorse or promote products derived from this software
 *       without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package net.gxf.gui.input.lwjgl;

import net.gxf.gui.component.GUI;
import net.gxf.gui.input.Input;

import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;

/**
 * Input handling based on LWJGL's Mouse & Keyboard classes.
 *
 * @author Matthias Mann
 */
public class LWJGLInput implements Input {

    private boolean wasActive;

    public boolean pollInput(GUI gui) {
        boolean active = Display.isActive();
        if(wasActive && !active) {
            wasActive = false;
            return false;
        }
        wasActive = active;
        
        if(Keyboard.isCreated()) {
            while(Keyboard.next()) {
                gui.handleKey(
                        Keyboard.getEventKey(),
                        Keyboard.getEventCharacter(),
                        Keyboard.getEventKeyState());
            }
        }
        if(Mouse.isCreated()) {
            while(Mouse.next()) {
                gui.handleMouse(
                        Mouse.getEventX(), gui.getHeight() - Mouse.getEventY() - 1,
                        Mouse.getEventButton(), Mouse.getEventButtonState());

                int wheelDelta = Mouse.getEventDWheel();
                if(wheelDelta != 0) {
                    gui.handleMouseWheel(wheelDelta / 120);
                }
            }
        }
        return true;
    }

}
